:root {
  /* Brand palette from logo */
  --cc-primary: #0d4680;   /* deep blue */
  --cc-secondary: #24aae0; /* cyan */
  --cc-neutral: #9cadb2;   /* gray */

  /* Material-ish dark surfaces */
  --bg: #0b0f17;          /* page background */
  --surface: #111827;     /* primary surface */
  --surface-2: #0f1a2a;   /* secondary surface */
  --surface-3: #0c1422;   /* deeper surface */

  /* Text */
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.68);
  --divider: rgba(255, 255, 255, 0.12);

  /* Accents */
  --primary: var(--cc-secondary); /* use cyan as primary accent in dark mode */
  --primary-soft: rgba(36, 170, 224, 0.16);
  --primary-soft-2: rgba(36, 170, 224, 0.08);

  --radius: 16px;
  --max: 1100px;

  /* Elevation (subtle, dark) */
  --e0: 0 0 0 rgba(0, 0, 0, 0);
  --e1: 0 1px 2px rgba(0, 0, 0, 0.35), 0 1px 3px rgba(0, 0, 0, 0.25);
  --e2: 0 10px 24px rgba(0, 0, 0, 0.35);
  --e3: 0 18px 48px rgba(0, 0, 0, 0.45);

  /* Motion */
  --t: 160ms;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: Roboto, ui-sans-serif, system-ui, -apple-system, Segoe UI, Arial,
    sans-serif;
  color: var(--text);
  background:
    radial-gradient(
      900px 600px at 12% 0%,
      rgba(36, 170, 224, 0.22),
      transparent 55%
    ),
    radial-gradient(
      900px 600px at 88% 0%,
      rgba(13, 70, 128, 0.26),
      transparent 60%
    ),
    radial-gradient(
      900px 600px at 50% 120%,
      rgba(156, 173, 178, 0.10),
      transparent 55%
    ),
    var(--bg);
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
iframe:focus-visible {
  outline: 3px solid rgba(36, 170, 224, 0.65);
  outline-offset: 3px;
  border-radius: 10px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 10px;
  background: var(--surface);
  border: 1px solid var(--divider);
  padding: 10px 12px;
  border-radius: 10px;
  z-index: 999;
  box-shadow: var(--e2);
}

.skip-link:focus {
  left: 10px;
}

/* App bar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(17, 24, 39, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.10);
  backdrop-filter: blur(10px);
}

.site-header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand-logo {
  height: 40px;
  width: auto;
  display: block;
  filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.55));
}

/* Nav */
.nav {
  display: flex;
  gap: 6px;
  align-items: center;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 12px;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.78);
  transition: background var(--t), color var(--t), box-shadow var(--t),
    border-color var(--t);
  border: 1px solid transparent;
}

.nav-link:hover {
  background: rgba(36, 170, 224, 0.10);
  color: var(--text);
  border-color: rgba(36, 170, 224, 0.18);
}

.nav-link.active {
  background: rgba(36, 170, 224, 0.16);
  color: var(--text);
  border-color: rgba(36, 170, 224, 0.26);
}

.container {
  max-width: var(--max);
  margin: 18px auto;
  padding: 0 16px;
}

/* Card */
/* Card with Material-ish surface tint */
.card {
  /* surface tint: a subtle primary-colored wash that increases perceived elevation */
  background:
    linear-gradient(
      180deg,
      rgba(36, 170, 224, 0.10),
      rgba(36, 170, 224, 0.03)
    ),
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.06),
      rgba(255, 255, 255, 0.02)
    ),
    var(--surface);

  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: var(--radius);
  box-shadow: var(--e2);
  padding: 18px;
}


/* Page text */
.page-title {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.page-subtitle {
  margin: 0 0 16px;
  color: var(--muted);
  line-height: 1.5;
}

/* Landing hero */
.hero-blank {
  min-height: 58vh;
  display: grid;
  place-items: center;
  padding: 22px;
  border-radius: var(--radius);
  background:
    radial-gradient(
      700px 420px at 50% 35%,
      rgba(36, 170, 224, 0.16),
      transparent 60%
    ),
    linear-gradient(180deg, rgba(13, 70, 128, 0.16), transparent 70%);
}

.hero-stack {
  width: 100%;
  display: grid;
  justify-items: center;
  gap: 16px;
}

/* Hero logo */
.hero-logo {
  display: block;
  width: 100%;
  max-width: 520px;
  max-inline-size: 100%;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 10px 26px rgba(0, 0, 0, 0.55));
}

/* Material-ish entrance animation */
.hero-logo-enter {
  opacity: 0;
  transform: translateY(10px) scale(0.985);
  transition:
    opacity 220ms cubic-bezier(0.2, 0, 0, 1),
    transform 220ms cubic-bezier(0.2, 0, 0, 1);
  will-change: opacity, transform;
}

.hero-logo-enter.is-in {
  opacity: 1;
  transform: translateY(0) scale(1);
}

@media (prefers-reduced-motion: reduce) {
  .hero-logo-enter {
    transition: none;
    opacity: 1;
    transform: none;
  }
}

/* Embedded form area */
.form-frame {
  width: 100%;
  min-height: 920px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  background: #ffffff; /* keep Google Form readable */
  box-shadow: var(--e1);
}

/* Supporting text */
.note {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

/* Footer */
.site-footer {
  max-width: var(--max);
  margin: 10px auto 26px;
  padding: 0 16px;
  color: rgba(255, 255, 255, 0.62);
}

/* Buttons - Material 3-ish (no libs) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;

  height: 40px;
  padding: 0 16px;

  border-radius: 999px;
  border: 1px solid transparent;

  font-weight: 600;
  letter-spacing: 0.2px;
  cursor: pointer;

  transition:
    transform var(--t),
    background var(--t),
    border-color var(--t),
    box-shadow var(--t),
    color var(--t);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* Filled tonal - the "Material 3 tonal" look */
.btn-tonal {
  background: rgba(36, 170, 224, 0.18);
  color: var(--text);
  border-color: rgba(36, 170, 224, 0.26);
  box-shadow: var(--e1);
}

.btn-tonal:hover {
  background: rgba(36, 170, 224, 0.24);
  border-color: rgba(36, 170, 224, 0.34);
  box-shadow: var(--e2);
}

/* Outlined tonal - subtle alternative */
.btn-outline {
  background: transparent;
  color: rgba(255, 255, 255, 0.86);
  border-color: rgba(255, 255, 255, 0.18);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.28);
}

/* Text button */
.btn-text {
  background: transparent;
  color: rgba(255, 255, 255, 0.86);
}

.btn-text:hover {
  background: rgba(36, 170, 224, 0.10);
}

/* Focus ring aligns with your existing focus-visible rules */
.btn:focus-visible {
  outline: 3px solid rgba(36, 170, 224, 0.65);
  outline-offset: 3px;
}

/* Mobile */
@media (max-width: 640px) {
  .site-header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .brand-logo {
    height: 36px;
  }

  .hero-blank {
    min-height: 48vh;
  }

  .form-frame {
    min-height: 980px;
  }
}